Physics
Jack and a Jill are standing on flat ground in front of an empty well that extends a depth s below the ground. Jill tosses a penny down the well with an initial velocity u0, while Jack decides to toss a penny up with an initial velocity v0. How long does it take for Jack and ...

Grade 12 Trigonometry
The radius of the wheel is 12 cm, therefore the circumference ( 2pi r) = 2 .3/14. 12 is equal to 75.39822369 . According to the previous section of the question, the wheel rotates 15 times per minute( 60 seconds); therefore 15 times 75.39822369 that is equal to 904.7786842 , ...

computer
I need help ?you are employed as an IT manager in GOTEC ,which is a small sized company (with 20 employers )that is based in London ,the company sells desktop computers and accessories . to help develop your understanding about basics of computer networking ,you have been ...

computer
I need help ?you are employed as an IT manager in GOTEC ,which is a small sized company (with 20 employers )that is based in London ,the company sells desktop computers and accessories . to help develop your understanding about basics of computer networking ,you have been ...

computer
identify the components of local area networks and wide area networks and explain the characteristics of LAN and WAN by focusing on the benefits associated to their deployments.can anyone help me please ?

Chemistry
1.33dm3 of water at 70°C = 2.25moles of Pb(NO3)2 and 4.5dm3 of water contains x moles of the salt, by calculation, x=7.62 moles..likewise at 18°C, 1.33dm3 of water contains 0.53 moles of the same salt and at 4.5dm3 of water, it contains x..x is 4.5x0.53/1.33=1.79moles...

math
LCM of 10a and 15a^2 Factors of 10a are 10,a,2,5 but the prime factors are 2,5,a Factors of 15a^2 are 15,a^2, 3,5,a,a Prime factors are 3,5,a,a Common between two are 5 and a So is the LCM of 10a and 15^2 5a?

math
And since the circle of the cone is placed on top of the cylinder, do I do 2πr^2 since it covers 2 surfaces? Also for the hemisphere, I'm not understanding what formula to use since it is at the bottom of the rectabgular prism. They're connected.do I still use 3...

math
Now I have to find the overlap. So: Cone πr2= 50.26548246 And I don't get how to subtract the overlap of tye hemisphere

math
Surface area of a composite object. A cone with a slant height of 8.9cm and a radius of 4cm. The cones base is attached on top of a rectangular prism whose length is 41cm, width is 20cm and height is 40cm. It is attached with a hemisphere whose radius is 4cm. Find the surface ...

biomechanics
an orienteer runs 300m north and then 400m to the southeast (at a 45 degree angle to north). if he runs at a constant speed, how far away is he from the starting position?

Waves and optics
Find the binding energy per nucleon in J and eV for the three following isotopes, given their atomic masses in u: 22(A) 6(Z) of carbon 22.0572097 u

maths
how many 2/3L bottles can i completely fill from a 40L tank of water?

maths
point A(4,6) and point B(7,9) are connected by straight line .what is the length of the line?(Pythagoras)

Physics
The observed frequency of a train whistle is 513Hz as it approaches a stationary observer and is 432Hz as it recedes. Find the speed of the train

Physics
The 2nd harmonic of a string of length 60cm and linear mass density 1.7g/m has the same frequency as the 5th possible harmonic of a closed pipe of length 1.2m. Find the tension in the string.

physics
A police car moving at 75m/s is initially behind a truck moving in the same direction at 14m/s. The natural frequency of the car's siren is 1000Hz. What is the change in frequency observed by the truck driver as the car overtakes him?

maths
can anyone help me ,how i can find maths higher past paper of 4 November 2015 by Mr barton?

Physics
A police car approaches a large wall at 51m/s. Its siren emits a 980 Hz signal. What is the frequency of the reflected sound observed by the officer?

English
please help me , its level 2 trinity / esol skills for life level 2 i have reading and writing exam ,do you guys know Any good websites I can use to improve it? its will be descriptive text,explanatory text,persuasive text for writing ,formal litter,compiling litter , email ?

English
its level 2 trinity / esol skills for life level 2 no we not using any specific book its will be descriptive text,explanatory text,persuasive text for writing ,formal litter,compiling litter , email

English
please help me ,i am doing level 2 English and i have reading and writing exam ,do you guys know Any good websites I can use to improve it ?

maths
the diagram below shows a fair spinner with 6 equally sized sections .mike did an experiment and carried out n spins , the spinner landed on the number 5 a total of 37 times .estimate the value of n?

maths
Kelly drives from town A to town B WITH an average speed of 30mph the journey takes her 2 hours 15 minus to get from town A to B .whats is the distance between the tow towns ?

maths
john thinks of 2 different numbers .they have a sum of 12 and a difference of 2 .what are tow numbers?

maths
Steve is trying to make the weight for a Boxing match. Steve needs to be 72kg or less for fight night. He is currently 79kg. His trainer tells him he can lose 4lbs a week comfortably. Given 1kg = 2.2lbs find how many weeks it will take Steve to reach his target weight of 72kg...

maths
a car depreciates at rate of 10%per year. the car cost £20000 new. (a) explain why the car wont be worth £16000 after 2 years (b) show that the car will be worth £16200 after 2 years and find the value of the car after 3 years (c) describe the type of ...

physics
A particle moving in simple harmonic motion passes through the equilibrium point x=0, 3 times per second. At t=0 its velocity at x=−0.0325m is negative. It travels 0.5m in a complete cycle. a) what is the phase constant in cm. i found the equation: x(t)=12.5sin(3pi t +x...

Math
1.if 40% of pupils in a school are boys,what percentage of the pupils are girls? 2.increase 448 by 25% 3.decrease 20.00 by 5%

Physics
A police car approaches a large wall at 51m/s. Its siren emits a 980 Hz signal. What is the frequency of the reflected sound observed by the officer

physics
A block of mass m1=3.70kg on a frictionless plane inclined at angle 30 deg is connected by a cord over a massless, frictionless pulley to a second block mass m2= 2.30kg. What is... a) The magnitude of the acceleration of each block? b) The direction of the acceleration of the ...

math
Many people are trying to reduce their carbon footprint. Amritas carbon footprint this year was 85% of last years footprint. If her carbon footprint this year is 34 tonnes, what was her carbon footprint last year? please help!!!!

math
store that sells posters charges $ 7 a poster plus a fixed $ 1.50 for shipping and handling. *1*Write a rule c (p) that describes the relationship between the number of posters p and the total cost for the posters (c)? *2*What is the charge for four posters? *3* If the cost is...

mba
identify several ways you current use accounting information in student life

Trigonometry
sin2A= 2sinAcosA now we know that cosA=-3/4, and theta is in the second quadrant so you sketch a triangle in the second quadrant, remember the bowtie method -3 is a leg and 4 is the hypotenuse based on sohcahtoa plug these two into the pythagorean theorem to find the missing ...

physics
an aluminium of mass 2.1 kg rests on a steel platform. A horizontal force of 15N is applied to block(a) given the coefficient of limiting friction is 0.61 will the block move? (b)if it moves what will be its acceleration?

Physics
Problem 1- A 4 kg puck can slide with negligible friction over a horizontal surface, taken as the xy plane.  The puck has a velocity of 3i m / s at one instant ti = 0 . Eight seconds later, its velocity is to be  8i + 10 j m / s . Find the magnitude and ...

Physics
Problem 3- Blocks A, B, and C are connected by ropes and placed as in the figure. Both A and B weigh 22.6 N each, and the coefficient of kinetic friction between each block and the surface is 0.40. Block C descends with constant velocity. a) Draw free-body diagram of objects A...

Physics
A 4 kg puck can slide with negligible friction over a horizontal surface, taken as the xy plane.  The puck has a velocity of 3i m / s at one instant ti = 0 . Eight seconds later, its velocity is to be  8i+10 j m / s . Find the magnitude and direction of the ...

Physics
The maximum possible value for the coefficient of static friction ?

Physics
An 100kg box is placed on the ramp. As one end on the ramp is raised the box begin to move down ward just as the angle of inclination reaches 15 degree . What the coeffenict of static friction between box and ramp .. ?

Physics
A500 man stands at the center of the rope such that each half of the ropes makes an angle of 10 with the horizentle . What is the tension of the rope ???

Physics
A15N crate rests on an ramp , the maximum angle just before it slips is 25 degree with the horizantle , what the coefficient of static friction between the crate and ramp surfaces ?

Physics
Acceleration due to gravity on the moon's surface is 1/6th that on the earth . An object weight 900N on the earth . What does it weight on the moon ?

Physics
At t=0, a particle leaves the origin with a velocity 6m/s in the positive x direction and moves in the x-y plane with a constant acceleration (-2i-4j)m/s2 How far the particle from the origin at t=1 ?

math
two parallel chords lie on opposite sides of the centre of a circle of radius 13cm.their lengths are 10cm and 24cm. what is the distance between the chords

Physics
Problem 2- 1. As a ship is approaching the dock at 45 cm/s, an important piece of landing equipment needs to be thrown to it before it can dock. This equipment is thrown at 15.0 m/s at 60∘ above the horizontal from the top of a tower at the edge of the water, 8.75 m ...

Physics
Problem 2- A boat has a velocity of 0.54 m/s southeast relative to the earth. The boat is on a river that is flowing 0.60 m/s east relative to the earth

Physics
Problem 1- A dog running in an open field has components of velocity vx = 2.2m/s and vy = -2.5m/s at time t1 = 12 s. For the time interval from t1 = 12 s to t2 = 24 s , the average acceleration of the dog has magnitude 0.55 m/s2 and direction 25.5∘ measured from the +x...

Physics
A students adds two vectors with magnitude of 200 and 40 , what is the resultant ?!

Physics
Ahmad throws a ball straight up. For which situation is the vertical velocity zero? [Note: Neglect the air resistance] Answer at the top on the way up none of the above on the way down

Physics
1)The speedometer on a cars dashboard measure average speed average velocity instantaneous acceleration instantaneous speed 2)A car moving on a straight road increases its speed from 30 m/s to 50 m/s in a distance of 180 m. If the acceleration is constant, how ...

Physics
A rocket, initially at rest, is fired vertically with an upward acceleration of 10 m/s2. At an altitude of 500 m, find its velocity. 1000 m/s 500 m/s 100 m/s 10 m/s

Physics
Problem 4- Speedy car, driving at 30 m/s. The driver suddenly observes a slow-moving van 155 m ahead traveling at 5 m/s in the same direction. The driver of the car immediately applies the brakes causing a constant acceleration of 2 m/s2 in a direction opposite to the cars ...

Physics
Can I solve it in the equation of motion in one dimension ????

Physics
Problem 3- If a bug can jump straight up to a height of 0.5 m. a) what is its initial speed as it leaves the ground? b) How long is it in the air?

Physics
Problem 2- A car is stopped at a traffic light. It then travels along a straight road so that its position from the light is given by x(t) 2.5t - 0.13t^2 in meters. c. What is the position of the particle when it reverses its motion?

Physics plz
Do any teacher here have an email plz becouse I want to send some pictures for question ,,, physics plz or how can I attach picture here ????